Function validate_agent_binary_paths 

pub fn validate_agent_binary_paths(
    agent: &AgentConfig,
    label: &str,
) -> Result<()>

Validate that all configured binary paths are non-empty strings.

Checks each binary path field in AgentConfig - if specified, it must be non-empty after trimming whitespace.

Arguments

• agent - The agent config to validate
• label - Context label for error messages (e.g., “agent”, “profiles.dev”)

Binary fields validated

• codex_bin, opencode_bin, gemini_bin, claude_bin, cursor_bin, kimi_bin, pi_bin